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Weather April in Knoxville, United States of America Visitors to Knoxville during the month of April should plan on bringing a raincoat since it will be raining some days. The amount of rain is high with an average of 83mm (3.3in). The average maximum temperature lies around 16.0Â°C (60.8Â°F). This month is known as a chilly month.
CLIMATE OVERVIEW. Knoxville, Tennessee, gets 47 inches of rain per year. The US average is 37. Snowfall is 6 inches. The average US city gets 25 inches of snow per year. The number of days with any measurable precipitation is 119.On average, there are 204 sunny days per year in Knoxville, Tennessee.The July high is around 88 degrees.The January low is 30. Our comfort index, which is based on humidity during the hot months, is a 38 out of 100, where higher is more comfortable.The US average on the comfort index is 44.n average, there are 204 sunny days per year in Knoxville, Tennessee. The July high is around 88 degrees. The January low is 30. Our comfort index, which is based on humidity during the hot months, is a 38 out of 100, where higher is more comfortable. The US average on the comfort index is 44.